If you've been blaming your weight on your genes, get out and take a brisk walk. It will help fight your tendency toward overweight, a new study shows.

Researchers in Great Britain studied 12 genetic variants known to increase the risk of obesity and tracked the physical activity levels of 20,430 people.

They created a genetic summary score to quantify a person's risk of obesity and then examined whether an active life could reduce the genetic influence.

Findings: Physical activity can reduce the genetic tendency toward obesity by 40%, according to the research, reported Tuesday in PLoS Medicine.

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